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Opt."],"published-print":{"date-parts":[[2026,4,20]]},"abstract":"<jats:p>\n                    We propose and theoretically investigate a thermally tunable, dual-channel near-infrared absorber based on an amorphous silicon (a-Si)-integrated hybrid grating-photonic crystal. Utilizing rigorous coupled-wave analysis and coupled-mode theory, we demonstrate that the device achieves polarization-selective, near-perfect absorption (&gt;98%) governed by mode-selective critical coupling. Due to distinct spatial confinement, the structure exhibits a completely decoupled thermal response. One resonant mode achieves critical coupling with a high linear thermal sensitivity of 118.3\u00a0pm\/\u00b0C, while the other acts as an ultra-high-\n                    <jats:italic>Q<\/jats:italic>\n                    reference (\n                    <jats:italic>Q<\/jats:italic>\n                    \u224813147) that remains spectrally locked with a negligible sensitivity of 4.4\u00a0pm\/\u00b0C. 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